py2DIC: A New Free and Open Source Software for Displacement and Strain Measurements in the Field of Experimental Mechanics

• Main Authors: Valeria Belloni, Roberta Ravanelli, Andrea Nascetti, Martina Di Rita, Domitilla Mattei, Mattia Crespi
• Format: Article
• Language: English
• Published: MDPI AG 2019-09-01
• Series: Sensors
• Subjects: Digital Image Correlation; free and open source software; full-field displacement and strain measurement
• Online Access: https://www.mdpi.com/1424-8220/19/18/3832

Thanks to the advances in computer power, memory storage and the availability of low-cost and high resolution digital cameras, Digital Image Correlation (DIC) is currently one of the most used optical and non-contact techniques for measuring material deformations. A free and open source 2D DIC software, named <i>py2DIC</i>, was developed at the Geodesy and Geomatics Division of the Sapienza University of Rome. Implemented in Python, the software is based on the template matching method and computes the 2D displacements and strains of samples subjected to mechanical loading. In this work, the potentialities of <i>py2DIC</i> were evaluated by processing two different sets of experimental data and comparing the results with other three well known DIC software packages <i>Ncorr</i>, <i>Vic-2D</i> and <i>DICe</i>. Moreover, an accuracy assessment was performed comparing the results with the values independently measured by a strain gauge fixed on one of the samples. The results demonstrate the possibility of successfully characterizing the deformation mechanism of the investigated materials, highlighting the pros and cons of each software package.